Look, I understand free enterprise, but selling spots for a profit on a game that isn't even built yet, just rubs me the wrong way, it's speculation at it's worst. Go ahead and do it if you must, but you are not the kind of person that I would want to do business with.
As far as the OP goes, I certainly understand him wanting to sell his game since the location is no longer available, but under the circumstance I think he should be happy to break even, a small profit would be a bonus.